Composite ground



April 2, 1935. G. A. KNAPP 1,996,114

I COMPOSITE GROUND I Filed Aug. 19, 1955 Egg 1 if 5 Patented Apr. 2, 1935' The present invention has to do with I a com-i posite :ground- (and the method -of making the same;a'nd refers more-particularlyto a ground" useful in plastering and-in terrazzo-work.

At the present i time, terrazzo- :workembodies the laying of floors and mop boards with plastic compositiomwhich-is plastic when-laidand which; is smoothed and'gwhen hard; is smoothed by honing. 'Ini'connection with-sueh'work; grounds are utilizedto define-block-like appearancesin the floors, and-,- in p l-a'sterwork'; are-utilizedfored ing and corners, I andalso as separation between thedifferentmaterials. I

. An important -feature or a ground, useful in terrazzo work, requires that i thef'rib or such ground", be so constructed as hetto-be harmedby the'honing process If There are in use atthe present timeg grounds inwhich the ribs *are made by-folding parts-of .v the material or which the"ground'isf-inadegto form the i'ipstandi-ng ribs. In hpriingsuch ribs,

' sometimes. the" crests"a11 gjround 'jofif resulting in provide smooth margins .for the floors,

'such 'asbrass,

tionship by acrimpi-ngaction; V 1

an imperfect ground and presenting; rough; and. uneven surfaces at'the-jointsk I i w The'pres'ent invention has to Q o witha com posite ground; -and rnethodof making, of snchj nature as-to presentgribs'whichare solid through-, out; and which may be readily honedwithout; def I structive ,or dangerous; 'ef fects,'- and which will.

An object of .the present inventionji 0 provide a composite; ground which maybe, economically manufactured'and which at the sametirnefprovides a rib. which may; be honedjwithoutjiharm-.

ful results. I .I

Anotherobject of the invention iswtdzprovide a c'ornposite ground having the base member of thin inexpensive material suohviorl instance, as"

alvanized metal; and .vtherribl' loi I solid; material, I

A further object of the inventionto provide I a composite ground wherein the.v base; members and rib mem-bers are :separately mam1factured or and theniastened: together in rpermanentgreler .is. to "ofiriaking composite 1 A still; further-: object for: the rinvention rovide'i a IlOVl'. 'm'ethod rounds. a I

Generally speaking the composite; ground; of the present invention contemplates a base member, which' lis perforated'to form binding holes for the terrazzo or plaster material, and which is also perforated to receive lugson the rib members whereby the rib members and base members atelypriornto'assembly.

* Bri a mayaabe. permanently "iastenedntoether crimping:action. it it 'T The invention further ontemplates-theutiliza-iz 1 tion of base; members. which iare' flat, throughout; the extent-of? the? same and in which f'the rib? members are crimped to the base members;

- The invention further. Icontempl'ates: agnovel manner of: manufacturing the rib; membersiwith minimum waste material and; at W :manufac-f turingcost} t 1' f";

The'i above; -.0ther vandi'further 'aobjects bf. the invention will: be apparent? from thesfollowing I description; accompanying zdrawingi -"and -ap-q pended;:c1ai1ns.-- v

, The accompanying drawing. illustrates: a composite 'ground'fcon'structed inaccordancewith; the."

1 principles of: the present inventiomandithe views v thereofsfareas followsii c I a. I

Figure 1 is a fragmental k'vertica]; sectional; view through. a :co'rnerJsho'win'g a floor and; mop board. lof: terrazzo, and: with grounds; embody-e1; I ing ithe principles of the presentinvention; in" place." 1 Figure 2 is} a fragmental :Side' elevatiQnaI: view of a'irib o'fthe present invention, andishowingi Figure? 3. is an isometric view of: a fragmental 1 portion. of" a composite ."groundt'made in accord with the principles ofrthez'prese'nt invention. I

Figure 4'is *an'isometric' View of: a fragme'ntal may beform'ed. e o c,

-=Figure ,5 is: an isometric". view of? fragmntaQl" I portions-of the base and rib members-immedi-II Thefdrawing will nowbeexplained: 1 "T --Referringto Fig-[1, a floonl'rofterrazzo supported onsub-structure 2 and thec-moplboar'dfli is'illustrateda's fashioned. as terrazzo. The =wall or plaster 4 is secured to s'tudding 5" in any de-'-*- sirablei'manner. I z "There 'are';-'-in this figure; shown two' composite grounds of the presentvinvention,idesig I hated at'A and'B. Eachyof these grounds i'sconstructed 7 the manner hereinafter described. r 4 i A composite groun'd ofithe-pres'ent invention contemplates a base member T 6, which is: na: Q 1 throughoi-it; and is fashiQned frOm "relatively in-" expensive material such,"f0r instance,-as galva i nized metalv The base member" 6- is 'providedwith: a plurality'of aperturesT-and 8*which serve as binding holes when the terrazzo materialis applied overthe grounds; In addition to the apertures I and 8, the base member. 6 is proin: section-[(3'e'rtain portions of the basefmember; v

I portion 10f a 'strip*fron1..Which two of jth ribs t" 40,

double the widthof a single rib, 'issubjected-tof a so , The rib member. of thepr'esent invention, designated at In, is made of strip brass material, or

other suitable material and as herein illustrated has formed in it cut-outportions such as arches I V temporary wooden strip, the plastererfinishes his ll arranged at spacedintervals in the len g th of the rib member, with the material of the mem 'ber between such; arches fasl iionedfas lugs; 12 At each end of every lug shoulders arejformed asat I 3, which engage against'the upper side of- :the base member 6 'to-limit 'the penetration of- I lugs IZinto the apertures 9 in the base-meme ber 6, when the rib member is thereto ap-:

Preferably the rib members are formed :inthe] following manner. The strip of material, [4,01

suitable'machinery for punching out partslthere- "of to form elongated slots l5 and for forming at the same timenotches I6 at the extremities of ythe slots l5. The slots, l5 and notches J6 are {symmetrically formed with respect to the center line of the, strip"l4. When the notches and slots have been formedin the manner stated. the strip I4 is then severed longitudinally thereof-along thegline I11 thereby. forming two simi lar rib members; Thershoulders I 3 of: the rib: members are indicated in Fig.1! and the portion:

of the rib member between the nshoulders,'ides- 'ignated at I 8 provide the lugs II; for entry into, the-l.apertures 9 of the base members 6.;;.The

' Y provision of the slots," in the mannerfst'ated;v provides, in the finishedrib member, spa'cesf l9; ti which serve as openings the rib: members whereby-when'the ground is attached to a lathe surface, it may-be fastened in ,placeby wire inserted through some of; the holes 8 irrthe' base G' and the spaceflfl in the ribs'.

manner described; enables manufacture athere- QfOlY' labor, The punching offthe basemember G-i's done by machineryand theformation'rof theslots l5 and notches 16 in the strip is done rby machineryfl as well as the splitting of ;.the,

strip l4 toaprovidethe Ifinished rib members. 1 L'I'he groundsfare assembled by inserting a rib' member ID in operativejrelation 'withthe' base member 6, with the lugs 12' of the strip member 7 extending through'the apertures 9 inthe'base 7 member. The rib member is pushed home until, the shoulders}! 3 thereof abutithei adjacent sur--; face ofthe base jmember 6', whereupon-the lugs are subjectedto s'wedging" or crimpingaction to crimp the extremities of the lugs in suchmanner as to. prevent separation of'the rib member. and

theba'se'member," 1 o ':The rib members, III in; the manner described, may be honed to smooth the floor hand' thus offerno uneven or rough surfaces when honed. --The. rib members being made of soft material, such'a's brassglend themselves very readily tolthehoning operation-for finishing-the terrazzo floor:

s It will be observed'that-grounds of'the present linvention may be economically manufactured','g

' p 1 speedily assembled; andare satisfactory in use.

The bases and ribs are separately 'made and I h then assembled in,permanentirelation,by;suitable" mt pressure, crimping orswedgmg and the like, cern tain-.cooperating' parts of the basesjandribs,

- In plastering walls and laying'terrazzo floors -the-joint-so-made. V v V V e a With the'use of metallic grounds, the need for 'Manufacturing the ;composition ground in the and baseboards, the common practiceis to plaster the walls first,-so that dirt and plaster will not fall on the finished terrazzo floor. The plaster One way to do this, 'at present, is toput'up'a work along thisstrip. Latenthe strip is removed V thus'leaving fa space ,below -the plasteri for the ter-f razzolayer. Such practice results in considerable damage to the plaster when the terrazzo is laid for patching the plaster along baseboards, requiring 'the'temporary wooden strip is eliminated, as the metallic ground remains permanently in place and provides a fixed terminal point forthe plas v terer and also deflnes the top of theterrazzofi baseboard.

Separation .of the plaster and terrazzomaterials 'bysuch grounds serves another: usefulg-purpose. W Usually Portland cement isem'ployed in' theterrazzo mix which is liable "to stain the whiteplaster of the walls where the terrazzdand plastermeet, V Theuse of grounds for-separating'thesematerials prevents such staining. 1 "I generically andnot by wayroflimitation,

cThe termgfrib has herein; convenience, been appliedto the upstanding part of the ground, v w yetit is to be understood that-suchterm is used} e9,

The; invention has been described; herein more;

o s ec se a o 'dota slyet'it isfto b der: I stood that the invention is notf to b'e limitedf therebyi'as changes maybe made in the arrange:

m oo pr t n of parts, a ou v l i may; besubstituted, 7 without departing-from ihe, spirit andscopeof the invention 1 The invention'isfclaimed; a

1. A composition groundi com p is ng in 'iom-.., V bination, a fiat base perforated to provide means 1 toreceivea rib, a rib fashioned to provide a plu: p

rality; of arched cut-outs along lone side and L spaced lengthwise of the rib; portionsfof the rib.

between said arches constituting lugs for enteri ing the receiving apertures in the base, saidgirib having shouldersadjacent the lugs to limit pene .tration of the lugs into thefbase, and said lugsl being swedged to lockqtherib to thelbase the V arched cuteoutsproviding in the rib 'spaces for the reception; of tie means for securing; said ground against lathor like surfaces. ;2.;:A composition groundcomprisinga flat base U having apertures in:it, a rib havingr longitudinally "spaced cut-out portions cut infrom. one margin of the, rib, the portions of the 'ribbetweemthe cut outs constituting attaching lugs, an d shoul'- 4 ders'distinct fromthe rib margin adapted to limit penetration of the; lugs into the baseapertur'esflj 3. Incombination with wall or floor construc tionfwherein different materials are, used to finish" such wall or floor, of grounds'serving to separate 7 such materialsfsaid' grounds/comprising base 'members'ada'pted to'be embeddedein'thejrnaterials as laid and. havingribstherein toserve'to I separate one mass of material fror'nianothensaidf bases and ribs having cooperating parts which are crimpeior clamped tolfasten -theiribs a'ndgbases' together, and saidebases' and ribsbeingprovided with apertures to receive means for tying said' 7 .GEORGE A; KNAPP; r I 1 grounds to lath or like surfaces; 1 Z 4 

